Claims
- 1. A catalyst system for the preparation of substantially terminally unsaturated atactic polymers or copolymers of α-olefins having a molecular weight (Mn) in the range 200-500,000, said catalyst system comprising a metallocene of the formula:[RmCpH(5-m)][RnCpH(5-n)]M(Z)y wherein CpH is a cyclopentadienyl ligand, Each R represents an alkyl or an aryl substituent on the CpH ligand or two R's may be joined together to form a ring, or the Rs in each CpH group when taken together represents an Si or C bridging group linking two CpH groups wherein said Si or C group may itself be substituted by hydrogen atoms or C1-C3 alkyl groups, M is a metal selected from the group consisting of hafnium, zirconium and titanium, Z is selected from the group consisting of a hydrogen atom, a trifluoromethane sulphonate, an alkyl and an aryl group, Y is selected from the group consisting of a halogenated and a 1,3-diketonate β-ketoester arion, and each of m and n is same or different and has a value from 0 to 5.
- 2. A catalyst system according to claim 1 wherein M is zirconium.
- 3. A catalyst system according to claim 1 wherein Z is C1-C3 alkyl or trifluoromethyl sulphonate.
- 4. A catalyst system according to claim 1 wherein the halogenated 1,3-diketonate is hexafluoroacetylacetonate.
- 5. A catalyst system according to claim 1 wherein the complex is:(C5H5)2Zr(CF3COCHCOCF3)SO3CF3 or (C5H5)2Zr(CF3COCHCOCF3)CH3.
- 6. A catalyst system according to claim 1 wherein R is methyl and n is 1-3.
- 7. A catalyst system according to claim 1 comprising a cocatalyst.
- 8. A catalyst system according to claim 7 wherein the cocatalyst is an aluminoxane.
- 9. A catalyst system according to claim 8 wherein the mole ratio of catalyst to cocatalyst is in the range 3000 to 1:1.
- 10. A catalyst system according to claim 7 wherein the cocatalyst is a Bronsted acid or a Lewis acid.
- 11. A catalyst system according to claim 10 wherein the cocatalyst is a trialkylammonium salt of tetra (pentafluorophenyl) boron or tris (pentafluorophenyl) boron.
- 12. A catalyst system according to claim 1 wherein the catalyst system is supported.
- 13. A catalyst system according to claim 12 wherein the support is silica.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9715317 |
Jul 1997 |
GB |
|
Parent Case Info
This is a continuation of PCT application PCT/GB98/02037, filed Jul. 10, 1998, the entire content of which is hereby incorporated by reference in this application.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
5444134 |
Matsumoto |
Aug 1995 |
A |
5461127 |
Naganuma et al. |
Oct 1995 |
A |
5565397 |
Sangokoya |
Oct 1996 |
A |
5807936 |
Fritze et al. |
Sep 1998 |
A |
Foreign Referenced Citations (2)
Number |
Date |
Country |
0 519 746 |
Dec 1992 |
EP |
0 591 756 |
Apr 1994 |
EP |
Continuations (1)
|
Number |
Date |
Country |
Parent |
PCT/GB98/02037 |
Jul 1998 |
US |
Child |
09/443896 |
|
US |